Evaluate a + b when a = –16.2 and b = –11.4 a. –27.6 b. –4.8 c. 4.8 d. 27.6

Thompson and thompson is a steel bolts manufacturing company. their current steel bolts have a mean diameter of 127 millimeters, and a variance of 36. if a random sample of 35 steel bolts is selected, what is the probability that the sample mean would differ from the population mean by greater than 0.5 millimeters? round your answer to four decimal places.

Gabrielle's age is three times mikhail's age. the sum of their ages is 40 . what is mikhail's age? __ years old

True or false? the sum of the differences (% - 7) is never zero for any distribution consisting of n observations.